Ensuring all data is gone

[Innectic]

I'm possibly getting a new phone here soon. I wanted to know how I could make sure none of my data is on the phone when I give it to the phone people if they ask for it. There's nothing bad on it, I just want to make sure. I know that a factory reset is not enough. Any ideas?

[Enderman]

some program that overwrites empty space with 0s

[ThatOneRussian]

destroying the phone. even if you delete the data it can still be accessed. You have to wipe the phone of all data and then put useless crap on it over and over so no one can access your files

[Muz]

You can re-flash the OS, it will erase everything and all the settings.

[Innectic]

some program that overwrites empty space with 0s

Any suggestions?

[Innectic]

You can re-flash the OS, it will erase everything and all the settings.

How would I go about doing that?

[Muz]

How would I go about doing that?

First question, iOS or Android?

[Innectic]

First question, iOS or Android?

Android

[Muz]

Android

Tons of guides online, probably one for your specific phone, just do a quick google search.

[Innectic]

Tons of guides online, probably one for your specific phone, just do a quick google search.

And you were right. There was 12 for mine. Thanks!

[Amazingasian]

Android

http://xda-developers.com  

 

Find a stock ROM for your phone there then flash it.

[ThatOneRussian]

You can re-flash the OS, it will erase everything and all the settings.

You can still access the files if you know how